scholarly journals Synthesis and Characterization of Lead Dibutyl Dithiophosphate Nanoparticles

2021 ◽  
Vol 14 (3) ◽  
pp. 350-359
Author(s):  
Svetlana V. Saikova ◽  
◽  
Dmitriy I. Chistyakov ◽  
Diana I. Saykova ◽  
Yury L. Mikhlin ◽  
...  
Keyword(s):  
Absorption Maximum ◽  
Lead Nitrate ◽  
Synthesis And Characterization ◽  
Optimal Conditions ◽  
Reaction Parameters ◽  
Synthesis Of Nanoparticles ◽  
Composition And Structure ◽  
Average Size ◽  
20 Nm

We examined the interaction of aqueous solutions of lead nitrate and sodium dibutyl dithiophosphate and showed the formation nanoparticles of lead dibutyl dithiophosphate. The effect of reaction parameters on the synthesis of nanoparticles was studied and the optimal conditions for the formation of their stable hydrosols were determined. The obtained products were investigated by methods of optical spectroscopy, dynamic light scattering. The average size of 15–20 nm, but due to the low surface charge, they are combined into larger aggregates. The UV‑vis spectra has absorption maximum at about 320 nm. TEM micrographs and Pb 2p, S2p XAS spectra revealed a composition and structure of the particles. These nanoparticles can play an important role in the flotation of sulfide minerals of nonferrous metals

scholarly journals Synthesis and characterization of isoniazid immobilized polylactide-co-glycolide nanoparticles

2021 ◽  
Vol 101 (1) ◽  
pp. 61-70
Author(s):  
Ye.M. Tazhbayev ◽  
◽  
A.R. Galiyeva ◽  
T.S. Zhumagaliyeva ◽  
M.Zh. Burkeyev ◽  
...  
Keyword(s):  
Physicochemical Parameters ◽  
Surfactant Concentration ◽  
Synthesis And Characterization ◽  
Optimal Conditions ◽  
Drug Form ◽  
Synthesis Parameters ◽  
Antituberculous Drug ◽  
Average Size ◽  
Instrumental Methods

This article considers someaspects of synthesis and characterizationof polylactide-co-glycolide nanoparticles immobilized withthe antituberculous drug isoniazid. The influence of some synthesis parameters of nanoparticles (the ratio of drug substance:polymer and surfactant concentration) onproperties of the obtained nanosomal drug form of isoniazid has been studied. Optimal conditions for obtainingthenanoparticles with the best physicochemical parameters such as: particle size, polydispersity, conversion, etc. have been found. These nanoparticlescan be used asdrug carriers.The results revealed thata polymer: drug ratio of 1:1 and the use of 3% Twin 80 are necessaryto obtain stable emulsions of nanoparticles of polylactide-co-glycolide with satisfactory characteristics. Average size of the obtained particles was 196.4 nm,and the polydispersity value was 0.323. The aggregation stability of nanoparticles during 4 hours at temperatures of 4ºC and 20ºC has been evaluated. The morphology of the obtained nanoparticles has been studied.Analysis of nanoparticles was characterized by various instrumental methods includinggas chromatography and thermogravimetrytechniques. The resulting nanoparticles of polylactide-co-glycolide immobilized with isoniazid are stable in time andcanprolong the action of the drug. In vitrorelease of isoniazid from polylactide-co-glycolide nanoparticles hasbeen studied.

scholarly journals Synthesis and Characterization of Neodymium Oxide in Silica Matrix by Solgel Protocol Method

2008 ◽  
Vol 2008 ◽  
pp. 1-4 ◽  
Author(s):  
Surender Duhan ◽  
Paveen Aghamkar ◽  
M. Singh
Keyword(s):  
Rare Earth ◽  
Ftir Spectroscopy ◽  
Structural Changes ◽  
Neodymium Oxide ◽  
Silica Matrix ◽  
Synthesis And Characterization ◽  
Thermal Treatments ◽  
Average Size ◽  
20 Nm

Formation of nanocrystalline rare earth was prepared by solgel route, using tetra-ethoxysilane and Nd (NO3)3 as precursor materials and HCl as a catalyst. The prepared samples were submitted to thermal treatments at temperature 500∘C (5 hours) and 800∘C (10 hours). Structural changes were investigated by XRD, FTIR spectroscopy, and SEM. At 800∘C (10 hours) resulted in the formation of cubic Nd2O3 nanocrystallites with average size ∼ 20 nm.

Synthesis and characterization of Au, Pt supported on graphene aerogel catalysts for CO oxidation at low temperature

2021 ◽  
Vol 11 (1) ◽  
pp. 118-122
Author(s):  
Chuyen Phan Thi ◽  
Hang Tran Thi Thanh ◽  
Phong Pham Nam ◽  
Ha Vu Thi Thu
Keyword(s):  
Low Temperature ◽  
Ambient Temperature ◽  
Co Oxidation ◽  
Pt Nanoparticles ◽  
Molar Ratio ◽  
Synthesis And Characterization ◽  
Graphene Aerogel ◽  
Highly Dispersed ◽  
Average Size

Au, Pt supported on graphene aerogel catalysts (PtAu/rGOA) with molar ratio of Pt and Au of 1:1, and total metal concentration of 5 % were successfully synthesized by hydrothermal method.  The obtained catalysts were characterized by Raman, XRD, XPS, HR-TEM, BET. It revealed that Au and Pt nanoparticles with average size of 3 – 5 nm were highly dispersed on aerogel graphene. The activity of these catalysts was tested  in CO oxidation. The results showed that the conversion of CO at ambient temperature was 100% during 25 minutes. Accordingly, PtAu/rGOA could be considered as a potential catalysts for CO oxidation at low temperature.

scholarly journals Síntese, caracterização e estabilidade de nanopartículas de magnetita

2021 ◽  
Vol 3 (4) ◽  
pp. 2738-2749
Author(s):  
Monise Cristina Ribeiro Casanova Coltro ◽  
Warde Antonieta da Fonseca-Zang ◽  
Joachim Werner Zang ◽  
Danilo César Silva e Sousa
Keyword(s):  
New Technology ◽  
X Ray Diffraction ◽  
Synthesis Of Nanoparticles ◽  
Research Areas ◽  
Magnetite Fe3o4 ◽  
Mineral Substance ◽  
Abundant Element ◽  
The Stability ◽  
Average Size

Nanopartículas de ferro são muito utilizadas em diversas áreas de pesquisa. O elemento químico ferro (Fe), sendo o quarto elemento mais abundante na crosta terrestre, e a substância mineral magnetita, com propriedade magnética, apresentam aplicações nas áreas industrial, ambiental, biomédica e de novas tecnologias. Este trabalho apresenta processo de síntese de nanopartículas partindo-se de sais precursores, bem como a caracterização dos produtos e as rotas para estabilizá-los. Os sais químicos precursores utilizados foram o cloreto férrico (FeCl3) e o sulfato ferroso (FeSO4) na proporção de 2:1, sob agitação por ultrassom e pH ácido. Para formação do precipitado de nanopartículas usou-se solução aquosa de hidróxido de sódio (NaOH) de pH 12. A difratometria de raio-X, mostra a presença de magnetita (Fe3O4) indicada pelos picos característicos de difração em graus 2Ө = 18° (largo), 31° (fino), 36° (bem definido), 43,4°, 45°, 53,6°, 57,7°, 63,3°. A microscopia eletrônica de transmissão mostra a morfologia dos produtos da síntese. Fatores que influenciam a estabilidade das partículas são agitação, o ajuste de pH, condições de secagem. O tamanho médio das nanopartículas de magnetitas é de aproximadamente 15 nm.   Iron nanoparticles are widely used in several research areas. The chemical element iron (Fe), being the fourth most abundant element in the earth's crust, and the mineral substance magnetite, with magnetic properties, have applications in industrial, environmental, biomedical, and new technology areas. This work presents the process of synthesis of nanoparticles starting from precursor salts, as well as the characterization of the products and the routes to stabilize them. The precursor chemical salts were ferric chloride (FeCl3) and ferrous sulfate (FeSO4) in a 2:1 ratio, under ultrasound agitation and acidic pH. For the nanoparticles growth was applied aqueous solution of sodium hydroxide (NaOH) at pH 12. X-ray diffraction shows the presence of magnetite (Fe3O4) indicated by characteristic diffraction peaks in degrees 2Ө = 18° (wide), 31° (fine), 36° (well defined), 43.4°, 45°, 53.6°, 57.7°, 63.3°. Scanning electron microscopy shows the morphology of the synthesis products. Factors that influence the stability of the particles are agitation, the pH adjustment, and the conditions of drying. The average size of the magnetite nanoparticles is approximately 15 nm.

scholarly journals Colloidal lead iodide nanorings

Nanoscale ◽  
2018 ◽  
Vol 10 (45) ◽  
pp. 21197-21208 ◽  
Author(s):  
Eugen Klein ◽  
Leonard Heymann ◽  
Ana B. Hungria ◽  
Rostyslav Lesyuk ◽  
Christian Klinke
Keyword(s):  
Formation Process ◽  
Optical Measurements ◽  
Synthesis And Characterization ◽  
Lead Iodide ◽  
Ring Structures ◽  
Colloidal Lead ◽  
20 Nm

We present the synthesis and characterization of PbI2 nanorings prepared via a direct colloidal route. The ring structures are obtained by etching as prepared PbI2 nanosheets with trioctylphosphine and possess thicknesses between 20 nm and 85 nm and lateral dimensions of up to 10 μm. The formation process was analyzed and discussed as well as the electrical and optical measurements.

Synthesis and Characterization of Cu2FeSnS4 Semiconductor Nanocrystals with Zincblende Structure

2012 ◽  
Vol 512-515 ◽  
pp. 2019-2022 ◽  
Author(s):  
Xiao Lu Liang ◽  
Xian Hua Wei
Keyword(s):  
Random Distribution ◽  
Semiconductor Nanocrystals ◽  
Synthesis And Characterization ◽  
X Ray Diffraction ◽  
X Ray ◽  
Selected Area Electron Diffraction ◽  
Transmission Electron ◽  
Nir Absorption ◽  
Average Size

Cu2FeSnS4semiconductor nanocrystals with zincblende structure have been successfully synthesized by a hot-injection approach. Cu+, Fe2+, and Sn4+cations have a random distribution in the zincblende unit cell, and the occupancy possibilities are 1/2, 1/4 and 1/4, respectively. Those nanocrystals were characterized by means of X-ray diffraction (XRD), transmission electron microscopy (TEM), selected area electron diffraction (SAED), energy dispersive spectroscopy (EDS), and UV-Vis-NIR absorption spectroscopy. The Cu2FeSnS4 nanocrystals have an average size of 7.5 nm and a band gap of 0.92 eV.

Synthesis and Characterization of Cobalt Nanoparticles by Cobalt-Acetate

2012 ◽  
Vol 503-504 ◽  
pp. 346-349
Author(s):  
Xia Yang ◽  
Hui Ping Shao
Keyword(s):  
Oleic Acid ◽  
Coercive Force ◽  
Cobalt Acetate ◽  
Cobalt Nanoparticles ◽  
Synthesis And Characterization ◽  
Hysteresis Curve ◽  
Vibrating Sample Magnetometer ◽  
Size Of Particles ◽  
Average Size

In this study, cobalt nanoparticles with an average size of 16 nm were synthesized using cobalt-acetate as precursor. Besides oleylamine and oleic acid, sodium oleate was selected as surfactants to control the size of particles. The obtained particles show cubic shape and uniformly disperse. The hysteresis curve of cubic nanoparticles detected by vibrating sample magnetometer (VSM) reveals that the coercive force Hc is 297.62 Oe and the saturation magnetization Ms is 56.55 emu/g.

Synthesis and Characterization of FePt Nanoparticle/Single Walled Carbon Nanotube Composites

2009 ◽  
Vol 620-622 ◽  
pp. 505-508 ◽  
Author(s):  
Yan Wang ◽  
Lian Gao ◽  
Jing Sun ◽  
Yang Qiao Liu
Keyword(s):  
Carbon Nanotube ◽  
Synthesis And Characterization ◽  
Fept Nanoparticles ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon ◽  
Nanotube Composites ◽  
Potential Applications ◽  
Carbon Nanotube Composites ◽  
20 Nm

We report the synthesis and characterization of FePt nanoparticles (NPs)/single walled carbon nanotube (SWNTs) nanocomposites, which might have important potential applications to orient CNTs and the development of new catalysts. The crystallite size of FePt NPs is about 2.5-4 nm and the Fe atom content ranges from 50% to 65%. HiPCO SWNTs have been decorated with FePt nanoparticles under mild conditions without any pretreatment. When the bundle size of HiPCO SWNTs is about 20 nm, FePt NPs mostly attach on the sidewalls of SWNTs. The loading of FePt nanoparticles on the SWNTs bundles can be conveniently controlled by adjusting the initial amount of FePt NPs. The nanocomposite showed magnetic properties in a magnetic field. TEM, HRTEM, and EDS spectra were performed to observe the nanostructure of these nanocomposites.

Synthesis and Characterization of Stabilized Tetragonal Nano Zirconia by Precipitation Method

2019 ◽  
Vol 56 ◽  
pp. 142-151
Author(s):  
Hassan Shokry ◽  
Marwa Elkady ◽  
Hesham Hamad
Keyword(s):  
Phase Transformation ◽  
Crystallite Size ◽  
Calcination Temperature ◽  
Average Crystallite Size ◽  
Precipitation Method ◽  
Synthesis And Characterization ◽  
Calcination Temperatures ◽  
Ft Ir ◽  
20 Nm

Nano sized ZrO2 nanopowder was synthesized by precipitation method. Phase transformation was investigated as a function of calcination temperature by XRD, SEM , and FT-IR. It is indicated that the thermal anneling from 400 to 800 °C resulted in increasing the average crystallite size from 12 to 20 nm. As the calcination temperature increased, the crystallite size and the agglomeration were increased. The increase in the monoclinic content and grain growth are caused by the calcination temperatures even calcination at 800 °C.

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